show that (3×+7)^2-84×=(3×-7)^2
Answers
Answered by
7
Answer:
Step-by-step explanation:
The 1st bracket is in the formula (a+b)²=a²+2ab+b²
a=3x,b=7
The 2nd bracket is in the formula (a-b)²=a²-2ab+b²
a=3x,b=7
(3x)²+2 × 3x × 7+7²-84=(3x)²-2×3x×7+(7)²
9x²+42x+49-84=9x²-42x+49
9x²+42+49-(9x²-42+49)=84
9x²+42+49-9x²+42-49=84
9x²-9x²+42+42+49-49=84
84=84
∴LHS=RHS
HOPE THIS HELPS
PLZ MARK AS BRAINLIEST
Similar questions