## EXERCISE 12 C

QUESTION 1

Multiply :

(i) 12xy by -8x^{2}

(ii) -16a^{2}b^{2} by -5ab^{2}

(iii) $\left(\dfrac{3}{5}a^2b^2\right) \text{ by } \left(\dfrac{10}{27}ab^4\right)$

(iv) $\left(-\dfrac{11}{8}xy^3\right)\text{ by } \left(-\dfrac{24}{55}x^4\right)$

QUESTION 2

Multiply :

(i) (6x-5) by -3x

(ii) (12x^2-4x+5) by 8x^{3}

(iii) (3a^3x^3-4ay^2+7a^2y) by -4x^{2}ya^{2}

QUESTION 3

Find the product :

(i) (x+6)(x+11)

(ii) (2a+5)(3a-6)

(iii) (5x+2b)(5x-2b)

(iv) (6x^2-11x+7)(3x-4)

(v) (2x^{2}-3x-1)(x-5)

(vi) (a^{4}-a^{2}b^{2}+b^{4})(a^{2}+b^{2})

QUESTION 4

Multiply :

(i) (a-b+c) by (a-b-c)

(ii) (x^{3}-4x^{2}+5x-2) by (x^{2}+2x-1)

(iii) (2x^{2}-5x+3) by (5x^{2}-6x-4)

(iv) (3x^{4}-x^{2}+6x-7) by (x^{2}-3x+4)