Question

(3x+4) (3x-5) thodiye​

Answer 1

$\huge\bold{\gray{\sf{Answer:}}}$

Explanation:

Here ,this identity is used :

$\bold{\pink{\boxed{(x + a)(x - b) = {x}^{2} + (a - b)x -ab}}}$

Here,a=4 ; b=-5

$= > (3x + 4)(3x - 5) = {(3x)}^{2} + [(4 - 5)]x -4 \times ( 5)$

$\bold{= 9 {x}^{2} - x -20(Answer)}$

$\bold{\pink{(x + a)(x - b) = {x}^{2} + (sum \:of \:its\: constant\:term)x + product \:of\:its\: constant \:terms}}$

Other Identity related to this :

$\bold{\boxed{{(x + y)}^{2} = {x}^{2} + {y}^{2} + 2xy}}$

$\bold{\boxed{{x}^{3} + {y}^{3} = {x}^{3} + {y}^{3} + 3xy(x + y)}}$

$\bold{\boxed{(x + y)(x + z) = {x}^{2} + (y+ z)x + yz}}$

$\bold{\boxed{(x - y)(x -z) = {x}^{2} -(y+ z)x + yz}}$

Answer 2

→ (3x + 5 ) (3x - 5 )

→ 9x² - 15x + 15x - 25

→9x² - 25 ..... AnS

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