Distribute the multiplication:
$w\left(w-7\right)$w(w−7)
$-r\left(r+1\right)$−r(r+1)
$3a\left(a-16\right)$3a(a−16)
$-5t\left(5t-10\right)$−5t(5t−10)
Perform operations on polynomials, including adding, subtracting, multiplying, and dividing polynomials