標題:
math question 20point
發問:
最佳解答:
45 – x^2 – 4x > 0x^2 + 4x – 45 < 0(x + 9)(x – 5) < 0Since the product of the 2 terms is negative, 1 is positive and 1 is negative(x + 9>0 and x – 5<0) or(x + 9 < 0 and x – 5 >0) -9 < x < 5 or (x < -9 and x > 5) (rejected)-9 < x < 5
其他解答:
- X^2 - 4x + 1.45 >0X^2 + 4x - 1.45 <0( X -( -2+√(109/20)) ( X -( -2 -√(109/20)))<0-2 - √(109/20) < X < -2 +√(109/20)
math question 20point
發問:
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列步驟+解釋 solve the following inequalities by the algebraic method. 1.45-x^2-4x>0最佳解答:
45 – x^2 – 4x > 0x^2 + 4x – 45 < 0(x + 9)(x – 5) < 0Since the product of the 2 terms is negative, 1 is positive and 1 is negative(x + 9>0 and x – 5<0) or(x + 9 < 0 and x – 5 >0) -9 < x < 5 or (x < -9 and x > 5) (rejected)-9 < x < 5
其他解答:
- X^2 - 4x + 1.45 >0X^2 + 4x - 1.45 <0( X -( -2+√(109/20)) ( X -( -2 -√(109/20)))<0-2 - √(109/20) < X < -2 +√(109/20)
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