Math, asked by rosemary251, 4 months ago

disharupsa I am happy that u r online answer these also step by step pls​

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Answered by fatmanasreen825
1

Step-by-step explanation:

4 (iii) x²-(4+4)x-16=0

x²-4x-4x-16=0

x(x-4)+4(x-4)=0

(x-4) (x+4)=0

x-4=0 or x+4=0

x=4 or x= -4

Answered by rabababedin
1

Step-by-step explanation:

4.

i) a²+10a+25

= a²+ 2×a×5 +5²

= (a+5)²

ii) 81 - (x-2)²

= 9² - (x-2)²

= {9+(x-2)}{9- (x-2)}

= (9+x-2)(9-x+2)

= (7+x)(11-x)

iii) x²-8x +16

= x² - 2×x×4 +4²

= (x-4)²

5.

i) 998²

=(100-2)²

= 100²- 2×100×2 +2²

= 10000 - 400 +4

= 9604

ii) 61²-19²

= (61+19)(61-19)

= 80× 42

= 3360

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