factorise 9x2-y2+4y-4
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Answered by
121
yes,
given us that,
9x² - y² + 4y - 4
= 9x² - { y² - 4y + 4 }
= 9x² - { y² - 2.y.2 + (2 )² }
= 9x² - ( y - 2 )²
= (3x)²- ( y - 2 )²
= ( 3x - y - 2 ) ( 3x + y - 2 )
______________________________
two formula used:↓
a) → a² - b² = ( a - b ) ( a + b )
b) → ( a + b )² = a² - 2ab + b²
______________________________
given us that,
9x² - y² + 4y - 4
= 9x² - { y² - 4y + 4 }
= 9x² - { y² - 2.y.2 + (2 )² }
= 9x² - ( y - 2 )²
= (3x)²- ( y - 2 )²
= ( 3x - y - 2 ) ( 3x + y - 2 )
______________________________
two formula used:↓
a) → a² - b² = ( a - b ) ( a + b )
b) → ( a + b )² = a² - 2ab + b²
______________________________
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22
Answer:
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