### Rearrange:

Rearrange the equation by subtracting what is come the best of the equal authorize from both political parties of the equation : 2*(5*x+2)^2-(48)=0

## Step 1 :

Equation at the finish of step 1 :

2 • (5x + 2)2 - 48 = 0

## Step 2 :

2.1 advice : (5x+2)2 = 25x2+20x+4

## Step 3 :

Pulling out like terms :3.1 traction out like factors:50x2 + 40x - 40=10•(5x2 + 4x - 4)

Trying to aspect by splitting the middle term

3.2Factoring 5x2 + 4x - 4 The an initial term is, 5x2 its coefficient is 5.The center term is, +4x that coefficient is 4.The critical term, "the constant", is -4Step-1 : multiply the coefficient of the very first term by the constant 5•-4=-20Step-2 : uncover two components of -20 whose sum equates to the coefficient the the center term, i beg your pardon is 4.

 -20 + 1 = -19 -10 + 2 = -8 -5 + 4 = -1 -4 + 5 = 1 -2 + 10 = 8 -1 + 20 = 19

Observation : No two such components can be found !! Conclusion : Trinomial have the right to not it is in factored

Equation at the end of action 3 :

10 • (5x2 + 4x - 4) = 0

## Step 4 :

Equations which are never true:4.1Solve:10=0This equation has no solution. A a non-zero consistent never equates to zero.

Parabola, detect the Vertex:4.2Find the crest ofy = 5x2+4x-4Parabolas have a highest or a lowest allude called the Vertex.Our parabola opens up up and appropriately has a lowest allude (AKA pure minimum).We know this even prior to plotting "y" because the coefficient of the very first term,5, is hopeful (greater than zero).Each parabola has actually a vertical line of symmetry that passes v its vertex. Thus symmetry, the line of the opposite would, for example, pass through the midpoint the the 2 x-intercepts (roots or solutions) of the parabola. The is, if the parabola has actually indeed two genuine solutions.Parabolas can model countless real life situations, such together the height above ground, of an object thrown upward, ~ some duration of time. The peak of the parabola can carry out us v information, such as the maximum height that object, thrown upwards, deserve to reach. For this reason we want to be able to find the coordinates of the vertex.For any kind of parabola,Ax2+Bx+C,the x-coordinate the the vertex is given by -B/(2A). In our situation the x coordinate is -0.4000Plugging right into the parabola formula -0.4000 because that x we deserve to calculate the y-coordinate:y = 5.0 * -0.40 * -0.40 + 4.0 * -0.40 - 4.0 or y = -4.800

Parabola, Graphing Vertex and X-Intercepts :

Root plot because that : y = 5x2+4x-4 Axis of the opposite (dashed) x=-0.40 Vertex in ~ x,y = -0.40,-4.80 x-Intercepts (Roots) : source 1 at x,y = -1.38, 0.00 source 2 in ~ x,y = 0.58, 0.00

Solve Quadratic Equation by completing The Square

4.3Solving5x2+4x-4 = 0 by completing The Square.Divide both political parties of the equation through 5 to have 1 as the coefficient of the an initial term :x2+(4/5)x-(4/5) = 0Add 4/5 to both next of the equation : x2+(4/5)x = 4/5Now the clever bit: take it the coefficient that x, i beg your pardon is 4/5, divide by two, giving 2/5, and also finally square it giving 4/25Add 4/25 come both sides of the equation :On the right hand side us have:4/5+4/25The common denominator the the 2 fractions is 25Adding (20/25)+(4/25) gives 24/25So adding to both sides we ultimately get:x2+(4/5)x+(4/25) = 24/25Adding 4/25 has completed the left hand side right into a perfect square :x2+(4/5)x+(4/25)=(x+(2/5))•(x+(2/5))=(x+(2/5))2 things which space equal come the very same thing are additionally equal to one another. Sincex2+(4/5)x+(4/25) = 24/25 andx2+(4/5)x+(4/25) = (x+(2/5))2 then, according to the law of transitivity,(x+(2/5))2 = 24/25We"ll refer to this Equation as Eq.

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#4.3.1 The Square root Principle states that as soon as two things space equal, your square roots space equal.Note that the square root of(x+(2/5))2 is(x+(2/5))2/2=(x+(2/5))1=x+(2/5)Now, applying the Square source Principle come Eq.#4.3.1 we get:x+(2/5)= √ 24/25 Subtract 2/5 native both political parties to obtain:x = -2/5 + √ 24/25 due to the fact that a square root has actually two values, one positive and also the other negativex2 + (4/5)x - (4/5) = 0has 2 solutions:x = -2/5 + √ 24/25 orx = -2/5 - √ 24/25 keep in mind that √ 24/25 have the right to be created as√24 / √25which is √24 / 5