Question

What is the expression in factored form? x^2+13x+42

Answer 1

The answer is (x+6)(x+7)

Note that  ( x − a ) ( x − b ) = x 2 − ( a + b ) x + ( a × b )

Also note that  13 = 6 + 7  and  42 = 6 × 7

So  x 2 − 13 x + 42 = ( x − 6 ) ( x − 7 )

                                                hope it helps