Question

If y = 5-3√25 - 3√5, then find the value of (y^3)-(15y^2)+60y +40​

Answer 1

615 - 315√5

Explanation :-

★ Given :-

y = 5 - 3√25 - 3√5

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★ To Find :-

We have to find value of,

y³ - 15y² + 60y + 40 ....... (1)

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★ Solution :-

As, We have to find the value of equation 1. So, we will evaluate the value of y and after that we will put the value of the y in equation 1. So that, we can know the value of the equation 1.

y = 5 - 3(√5)² - 3√5

y = 5 - 3(5) - 3√5

y = 5 - 15 - 3√5

y = -10 - 3√5

_______________[Put Value of y]

${( - 10 - 3 \sqrt{5} )}^{3} - 15 {( - 10 - 3 \sqrt{5}) }^{2} + 60( - 10 - 3 \sqrt{5} ) + 40 \\ \\ {( - 10)}^{3} + { (- 3 \sqrt{5} )}^{3} - 15( - 100 - 45) - 600 - 180 \sqrt{5} + 40 \\ \\ - 1000 - 135 \sqrt{5} + 1500 + 675 - 600 - 180 \sqrt{5} + 40 \\ \\ - 1000 + 1500 + 675 - 600 + 40 - 135 \sqrt{5} - 180 \sqrt{5} \\ \\ 500 + 75 + 40 - 135 \sqrt{5} - 180 \sqrt{5} \\ \\ 575 + 40 - 315 \sqrt{5} \\ \\ 615 - 315 \sqrt{5}$

Answer 2

Step-by-step explanation:

pls mark it as the brainliest answer....

have a bright future ahead.....