Algebraic Expression Quiz 7

$(\sqrt a+\sqrt b)(\sqrt a-\sqrt b) =$ ............

$(\frac a3+\frac b5)(\frac a3-\frac b5)=.........$

Number of terms in $ax^2+bx+c$ is ………

$(a - b) (a^2 + ab + b^2) =$ ...........

(x + 3) (x + 2) =

$9x^2 - y^2 =$ ...........

$\frac{4a^2-1}{2a+1}=.......$

$(3x^2 - 7x + 9) \div0 =$ ........

$m^3 (m - 2) + 2m^2 (m + 3) - 6m (m - 4) =$ ..........

Cube of (a + 1) is = ……………