Exercise
$\left(x+7\right)\left(x-3\right)-m^2+21$
Step-by-step Solution
Learn how to solve special products problems step by step online. Expand the expression (x+7)(x-3)-m^2+21. Multiply the single term x-3 by each term of the polynomial \left(x+7\right). Multiply the single term x by each term of the polynomial \left(x-3\right). When multiplying two powers that have the same base (x), you can add the exponents. Multiply the single term 7 by each term of the polynomial \left(x-3\right).
Expand the expression (x+7)(x-3)-m^2+21
Final answer to the exercise
$x^2+4x-m^2$