Use the quadratic formula to solve the equation 5x2 3x 8

Use the quadratic formula to solve the equation. 5x^2 - 3x - 8 = 0 A) 8/5, -1 B) 5/8, -1 C) 5/8, 0 D) 5/8, 1 Use the quadratic formula to solve the equation. 2x^2 = -10x - 4 A) -5 plusminus Squareroot 17/4 B) -5 plusminus Squareroot 33/2 C) -10 plusminus Squareroot 17/2 D) -5 plusminus Squareroot 17/2

Solution

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5x^2 - 3x - 8 = 0

5 ( x^2 - (3/5)x) - 8 = 0

5 ( x^2 - (3/5)x + (3/10)^2) - 8 - 9/20 = 0

5 ( x- (3/10))^2 - 169/20 = 0

(x - 3/10)^2 = 169/100

x - 0.3 = + 1.3

x = 1.6, -1

x = 8/5, -1

Option A

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