Solve this:
8. Multiply:
a) (2x=5)2(4y-5)
b)(3x-6) & (4x+5)
c)(9+a) & (15a-7)
 

Dear Student,


$$\begin{gathered} To Multiply : \\ \left(a\right) (2x+5) and 2(4y-5) \\ =(2x+5)\times \left\{2\right(4y-5\left)\right\} \\ =(2x+5)\times (8y-10) \\ =2x(8y-10)+5(8y-10) \\ =16xy-20x+40y-50 \\ \left(b\right) (3x-6) and (4x+5) \\ =(3x-6)\times (4x+5) \\ =3x(4x+5)-6(4x+5) \\ =12x^2+15x-24x-30 \\ =12x^2-9x-30 \\ \left(c\right) (9+a) and (15a-7) \\ =(9+a)(15a-7) \\ =9(15a-7)+a(15a-7) \\ =135a-63+15a^2-7a \\ =15a^2+128a-63 \end{gathered}$$

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