(Based On Identities)
Q. Evaluate The Following
1.) 9.5*9.7
2.) 98*99
Answers
Answered by
1
Answer:
1) 9.5*9.7
= (9+0.5)(9+0.7)
= 9^2+9(0.5+0.7)+0.5×0.7
= 81+9×1.2+0.35
=81+10.8+0.35
= 91.8+0.35
= 92.15
2) 98*99
= (100-1) (100-2)
= 100×100+[-1×(-2)]-3×100
= 10000+2-300
= 10002-300
= 9700
.
.
hope u got ur answer :)
Answered by
1
Answer:
1.)92.15
2.)9702
Step-by-step explanation:
1.)9.5*9.7
=(9.6-0.1)*(9.6+0.1)
=(a+b)*(a-b)=a²-b²
=(9.6)²-(0.1)²
=92.16-0.01
=92.15
2.)98*99
=(90+8)*(90+9)
=(x+a)*(x+b)=x²+(a+b)*x+ab
=(90)²+(8+9)90+72
=8100+1530+72
=9702
Similar questions