(3x+4)(3x-5) Factorise
Answers
Answered by
1
Answer:
given
( 3x + 4 ) ( 3x - 5 )
either
3x ( 3x - 5 ) + 4 ( 3x - 5 )
= ( 3x )² - 5 × 3x + 4 × 3x - 5 × 4
= 9x² - 15x + 12x - 20
= 9x² - 3x - 20
or
3x - 5 = 0
x = 5/3
3x + 4 = 0
x = -4/3
Answered by
2
Factorisation is 9x^2-x-20
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