Question

Subtract the sum of 12ab−10b2−18a2and9ab+12b2+14a2from the sum of ab+2b2and 3b2−a2

Answer 1

Question

12ab -10b^2-18a^2+9ab+12b^2+14a^2

now take the like terms

12ab+9ab-10b^2+12b^2-18a^2 +14a^2

3ab+2b^2-4a^2

Answer 2

12ab−10b²−18a² + 9ab+12b²+14a²

=> 21 ab + 2b² - 4a²

ab+2b² + 3b²−a²

=> ab + 5b² - a²

ab + 5b² - a² - (21 ab + 2b² - 4a²)

=> ab + 5b² - a² - 21 ab - 2b² + 4a²

=> 3a² + 3b² - 20ab Ans.

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