Q. 4(1−t)=5t2Let t=x and t=y be the solutions to the given equation. What is the value of −xy ?
Write and expand equation: Write down the given equation and expand it.The given equation is 4(1−t)=5t2.Expanding the left side gives us 4−4t=5t2.
Rearrange to form quadratic equation: Rearrange the equation to form a quadratic equation. Bring all terms to one side to set the equation to zero. 5t2+4t−4=0
Apply Vieta's formulas: We have 5t2+4t−4=0, where a=5, b=4, and c=−4. Vieta's formulas states that for a quadratic equation ax2+bx+c=0, the sum of the roots is a−b and the product of the roots is ac. For the equation 5t2+4t−4=0, the product of the roots, xy, is xy=ac=5−4.
Calculate −xy: Calculate the value of −xy. −xy=−(−54)=54
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