Question

49x^2-42x+_ ? What should be added to make perfect square?​

Answer 1

Answer:

Mar-2018 · 2 answers

See below. Explanation: We know that (a+b)2=a2+2ab+b2. In our case: 9x2+42x+49=32⋅x2+2⋅9⋅7⋅x+72=(3x+7)2 This it's the same that.

See below Explanation