evaluate without multiplying directly ( 1.) 49 multiply 48. (2.) 1005 multiply by 995
situ66:
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Answers
Answered by
3
Answer:
2 answer 999975
Step-by-step explanation:
1005 ×995=1000+5×1000_5and can be solved by using a+b ×a_b=a^2_b^2=1000^2_5^2=999975
Answered by
4
Answer:
1. (49)×(48)
We use the identity: (x+a)(x+b)=x^2+(a+b)x+ab
{50+(-1)}{50+(-2)}
(50)^2+(-1-2)50+(-1)(-2)
2500-150+2
Ans. 2352
2. (1005)(995)
We use the identity: (x+y)(x-y) = x^2-y^2
(1000+5)(1000-5)
= (1000)^2-(5)^2
= 1000000-25
= 999975
Hope this helps you!!
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