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簡單數學題目一問
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1)find thw values of x: x^2-9x+32>=0 ---------- 2)solve:
最佳解答:
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其他解答:
1) a= 1, b=-9 , c =32 △=b^2-4ac =(-9)^2-4(1)(32) =-47 1, the curve should be a u shape opening upwards, so the solution of x^2-9x+32>=0 should be all real no. 2) 3x+y=0 y=-3x -------(1) 3x^2+4y-3=0 ------ (2) sub (1) into (2) 3x^2 +4(-3x) -3 = 0 3x^2 -12x-3=0 x= 4.24 or -0.24
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