68²-32²=100×
121=61²-
51×41=2000+50+40+
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SOLUTION
TO FILL IN THE BLANK
1. 68²-32²=100× ___
2. 121=61²- ___
3. 51×41=2000+50+40+ __
FORMULA TO BE IMPLEMENTED
We are aware of the formula that
a² - b² = ( a + b ) ( a - b )
EVALUATION
1. 68²-32²
= ( 68 + 32 ) × ( 68 - 32 )
= 100 × 36
2. 121
= 121 × 1
= ( 61 + 60 ) × ( 61 - 60 )
= 61² - 60²
3. 51 × 41
= ( 50 +1 ) × ( 40 + 1)
= 50× ( 40 + 1) + 1 × ( 40 + 1)
= 2000 + 50 + 40 + 1
FINAL ANSWER
1. 68²-32²=100× 36
2. 121=61² - 60²
3. 51×41=2000+50+40+ 1
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