X^2-x-2=0 quadratic formula

x = 2 , -1

Step-by-step explanation:

x^2-x-2 = 0

x = (-b ± √(b^2 - 4ac)) / 2 * a =

(1 ± √1 - 4 * 1 * -2) / 2 =

(1 ± √1--8) / 2 =

(1± √9 ) / 2 =

x = 1 + 3 / 2 = 4/2 = 2

x = 1 - 3 /2 = -2 / 2 = -1

62.5 inches

Step-by-step explanation:

We would solve this using ratio

Width : Length = Width/Length

For the Original photo

5 inches : 7 inches = 5/7

For the enlarged phots

x : 87.5 inches = x/87.5

Equating both ratios together, we have:

5/7 = x /87.5

Cross Multiply

7x = 5 × 87.5

7x = 437.5

x = 437.5/7

x = 62.5 inches

Hence, the width of the enlarged photo is 62.5 inches