Question

7(а^2-2)-4(a+3)(a-3)-3a^2-22
10(a^2-15)-12(a-4)(a+4)-42+2a^2

Answer 1

7(a^2-2)-4(a+3)(a-3)-3a^2-22=7a^2-14-4a^2+36-3a^2-22=7a^2-4a^2-3a^2-14+36-22=0