factor by letting m=x^2

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factor by letting m=x^2
a) 4x^4-37x^2+9
b) 9^4-148x^2+64

a) 4m^2-37m+9=(4m-1)(m-9) factor 就是(4m-1)和（m-9）
b) 9m^2-148m+64=(m-16)(9m+4)
先用m代替x的四次方和x的二次方,然后用十字相乘法就可以了
再问： letting m=x^2 这个是什么意思呀
再答：就是m=x的二次方，就是x乘以x

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