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Найди значение выражения \( (4-a)^{2}-a(a-26) \) при \( a=-3,42 \).

Ask by Wheeler Mcfarlane. in Russia
Jan 23,2025

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Tutor-Verified Answer

Answer

Значение выражения при \( a=-3,42 \) равно \( -45.56 \).

Solution

Подставим \( a=-3,42 \) в выражение \( (4-a)^{2}-a(a-26) \) и найдем значение. Evaluate the expression by following steps: - step0: Evaluate: \(\left(4-a\right)^{2}-a\left(a-26\right)\) - step1: Substitute: \(\left(4-\left(-3.42\right)\right)^{2}-\left(-3.42\left(-3.42-26\right)\right)\) - step2: Add the numbers: \(7.42^{2}-\left(-3.42\left(-3.42-26\right)\right)\) - step3: Subtract the numbers: \(7.42^{2}-\left(-3.42\left(-29.42\right)\right)\) - step4: Convert the expressions: \(\left(\frac{371}{50}\right)^{2}-\left(-3.42\left(-29.42\right)\right)\) - step5: Multiply the numbers: \(\left(\frac{371}{50}\right)^{2}-100.6164\) - step6: Rewrite the expression: \(\frac{371^{2}}{50^{2}}-100.6164\) - step7: Convert the expressions: \(\frac{371^{2}}{50^{2}}-\frac{251541}{2500}\) - step8: Rewrite the expression: \(\frac{371^{2}}{50^{2}}-\frac{251541}{50^{2}}\) - step9: Transform the expression: \(\frac{371^{2}-251541}{50^{2}}\) - step10: Simplify: \(\frac{371^{2}-251541}{2500}\) Значение выражения \( (4-a)^{2}-a(a-26) \) при \( a=-3,42 \) равно \( -45.56 \).

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The Deep Dive

Чтобы найти значение выражения \( (4-a)^{2}-a(a-26) \) при \( a=-3,42 \), сначала подставим значение \( a \): 1. Находим \( (4 - (-3,42))^{2} \): \[ (4 + 3,42)^{2} = (7,42)^{2} = 55,0564 \] 2. Теперь вычислим \( -3,42(-3,42 - 26) \): \[ -3,42(-3,42 - 26) = -3,42(-29,42) = 100,7184 \] Теперь подставим оба результата в выражение: \[ (4-a)^{2}-a(a-26) = 55,0564 - 100,7184 = -45,662 \] Итак, значение выражения при \( a=-3,42 \) равно \( -45,662 \).

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