Question

Question 1(iv)
Multiply the binomials:
(a+3b) and (x+5)

Answer 1

$(a+3b)\times (x+5)=a(x+5)+3b(x+5)$
$=a\times x+a\times 5+3b\times x+3b\times 5$
$=ax+5a+3bx+15b$