Can you help me find the domain of these expressions? 1.) -x^4+x^3+9x 2.) 2r^2-5/3r+6 3.) 1/sqrt(x-1)
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Originally Posted by DHS1 Can you help me find the domain of these expressions? 1.) -x^4+x^3+9x 2.) 2r^2-5/3r+6 3.) 1/sqrt(x-1) Does 5/3r mean 5/(3r) or (5/3)r? For domain questions such as these, remember: division by zero is undefined, and square root of a negative number is not in reals.
Originally Posted by undefined Does 5/3r mean 5/(3r) or (5/3)r? For domain questions such as these, remember: division by zero is undefined, and square root of a negative number is not in reals. Thank you. However I do know what you just said, I just can't figure those three problems out. And I meant (2r^2-5)/(3r+6)
Originally Posted by DHS1 Thank you. However I do know what you just said, I just can't figure those three problems out. And I meant (2r^2-5)/(3r+6) 1) All reals 2) Solve the inequality $\displaystyle 3r+6 \ne 0$ 3) Solve the inequality x - 1 > 0
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