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Яна7676
@Яна7676
November 2021
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zhenyaM2002
Verified answer
1)
2а(3а - 5) - 4а(4а - 5) = 6а² - 10а - 16а² + 20а =
= - 10а² + 10а = - 10а(а - 1)
при а = - 0,2
- 10*(-0,2) * ( - 0,2 - 1) = 2 * (-1,2) = - 2,4
2)
7ab(2a -3b) +2a(3a+10b²) = 14a²b -21ab² +6a² +20ab² =
= 14a²b +6a² - ab² = a(14ab +6a- b²)
при а = - 3 ; b = 5
- 3 * ( 14 *(-3)*5 + 6*(-3) - 5²) = - 3 *(-210 -18 - 25) = -3 * (-253) = 759
3)
2a⁴(3a² +a - 8) - 6a⁶ = 6a⁶ +2a⁵ - 16a⁴ - 6a⁶ = 2a⁵ - 16a⁴ =
= 2a⁴ * (a - 8)
при a = - 1
2* (-1)⁴ * ( - 1 - 8) = 2*1*(-9) = - 18
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Answers & Comments
Verified answer
1)2а(3а - 5) - 4а(4а - 5) = 6а² - 10а - 16а² + 20а =
= - 10а² + 10а = - 10а(а - 1)
при а = - 0,2
- 10*(-0,2) * ( - 0,2 - 1) = 2 * (-1,2) = - 2,4
2)
7ab(2a -3b) +2a(3a+10b²) = 14a²b -21ab² +6a² +20ab² =
= 14a²b +6a² - ab² = a(14ab +6a- b²)
при а = - 3 ; b = 5
- 3 * ( 14 *(-3)*5 + 6*(-3) - 5²) = - 3 *(-210 -18 - 25) = -3 * (-253) = 759
3)
2a⁴(3a² +a - 8) - 6a⁶ = 6a⁶ +2a⁵ - 16a⁴ - 6a⁶ = 2a⁵ - 16a⁴ =
= 2a⁴ * (a - 8)
при a = - 1
2* (-1)⁴ * ( - 1 - 8) = 2*1*(-9) = - 18