E Solve be factoring or by the quadratic formula where neces

E. Solve be factoring or by the quadratic formula where necessary. Show all work on the provided paper. pts each) 40 2x 4x 37. x +9x +14 0 38. 49 0 39. x -25 41. 2 +5x +3 o 42 3x2 -4x-4 0 43. x 2x 20x 0 21 P a g e 3 l P a g e

Solution

37) x^2 + 9x + 14 =0

solve by factorisation :

x^2 + 7x +2x + 14 =0

x(x+7) +2(x+7) =0

(x+2)(x+7) =0

x = -2 ; x= -7

solution : x= -2 , -7

38) x^2 - 49 =0

Use a^2 - b^2 = (a+b)(a-b)

x^2 - 7^2 =0

(x+7)(x -7)

39) x^2 = 25

x^2 - 25 =0

x^2 - 5^2 =0

(x +5)(x -5) =0

x = -5 , 5