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How do you simplify the expression #1+7sqrt(z-1)# for #z=290#?

Answer 1

Eli Assouline

#120#

Substitute z = 290 into the expression.

#1+7sqrt(color(red)(290)-1)#

#=1+7sqrt289#

#=1+(7xx17)" since " sqrt289=17#

#=1+119#

#=120#

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Answer 2

Julia Adams

To simplify the expression (1 + 7\sqrt{z - 1}) for (z = 290), substitute (z = 290) into the expression:

(1 + 7\sqrt{290 - 1} = 1 + 7\sqrt{289} = 1 + 7 \times 17 = 1 + 119 = 120).

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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