Question

Find the value of C + D if C minus D equal 2 and C into d equal 63

Answer 1

C - D = 2

C = D + 2

CD = 63

put the value of C = D + 2

(D + 2)D = 63

D^2 + 2D - 63 = 0

D^2 + 9D - 7D - 63 = 0

D(D + 9) -7(D + 9) = 0

(D + 9)(D - 7) = 0

D = 7, -9

When D = 7

C = 7 + 2

C = 9

When D = -9

C = -9 + 2

C = -7