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