Expand
$(2 a+3 b)(2 a-5 b)$
$4 a^{2}-4 a b-15 b^{2}$
Write the coefficients of $x^{2}$ in each of the following polynomials
$4+7 x+3 x^{2}$
Factorise :
$6 x^{2}+7 x-3$
Classify the following as a constant, linear,quadratic and cubic polynomials:
$4-5 y^{2}$
Evaluate the following products without multiplying directly
$88 \times 86$
Factorise
$9 x^{2}+42 x+49$
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