Question

use suitable identities to find the following products i) (3x+4) (3x-5)​

Answer 1

Answer:

heya mate ☺

$(3x + 4)(3x - 5) \\ = 9x ^{2} - 15x + 12x - 20 \\ = 9x ^{2} - 3x - 20$

hope it helps u ♨

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Answer 2

Using suitable identities,find the following products: (i) (3x+5)(3x+5)

$\rm \longrightarrow(3x + 5)(3x + 5)$

$\rm \longrightarrow {(3x + 5)}^{2}$

$\longrightarrow\boxed{ \bold \red {(a + b) = {a}^{2} + 2ab + {b}^{2}} }^{2}$

$\rm \longrightarrow {(3x)}^{2} + 2 \times 3x \times 5 + {(5)}^{2}$

$\longrightarrow\boxed{ \rm \underline \blue{ {9x}^{2} + 30x + 25}}$