Mathematics

what adds to be 10 but multiplies to be -171


Answers

emilyloveshorses

2 years ago Comment

The usual pattern is (x + a) * (x + b) = x^2 + (a + b)x + ab and the special case (x + a) * (x - a) = x^2 - a^2. When you recognize the pattern you can just write the answer from memory.