会的来挑战下~When an object is thrown vertically upwards,its height "h" varies with the time "t" according to the equation h=20t - 5t^2.At what times will the heighy be 10m?Use the formula to solve the quadratic equation.Formula就是x=[-b±√
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![会的来挑战下~When an object is thrown vertically upwards,its height](/uploads/image/z/1720088-8-8.jpg?t=%E4%BC%9A%E7%9A%84%E6%9D%A5%E6%8C%91%E6%88%98%E4%B8%8B%7EWhen+an+object+is+thrown+vertically+upwards%2Cits+height+%22h%22+varies+with+the+time+%22t%22+according+to+the+equation+h%3D20t+-+5t%5E2.At+what+times+will+the+heighy+be+10m%3FUse+the+formula+to+solve+the+quadratic+equation.Formula%E5%B0%B1%E6%98%AFx%3D%5B-b%C2%B1%E2%88%9A)
会的来挑战下~When an object is thrown vertically upwards,its height "h" varies with the time "t" according to the equation h=20t - 5t^2.At what times will the heighy be 10m?Use the formula to solve the quadratic equation.Formula就是x=[-b±√
会的来挑战下~
When an object is thrown vertically upwards,its height "h" varies with the time "t" according to the equation h=20t - 5t^2.At what times will the heighy be 10m?Use the formula to solve the quadratic equation.
Formula就是x=[-b±√(b^2-4ac)]/(2a)
会的来挑战下~When an object is thrown vertically upwards,its height "h" varies with the time "t" according to the equation h=20t - 5t^2.At what times will the heighy be 10m?Use the formula to solve the quadratic equation.Formula就是x=[-b±√
当h=10m,
20t - 5t^2=10
即 - 5t^2+20t-10=0
运用公式,即
x=[-b±√(b^2-4ac)]/(2a)
得 x=2-√2
或 x=2+√2