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- 9 years ago
2√28-3√63
2√28= 2√7√4 simplify the√4 to get 2 and multiply that by 2 and√7 to get 4√7
3√63= 3√7√9 simplify the √9 to get 3 and multiply that by 3 and√7 to get 9√7
since you now have like terms, it can be like simple math
4√7-9√7 is equal to your original 2√28-3√63 equation
4√7-9√7= -5√7
-5√7 is the answer
Source(s): me
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