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

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factorbylettingm=x^2a)4x^4-37x^2+9b)9^4-148x^2+64factorbylettingm=x^2a)4x^4-37x^2+9b)9^4-148x^2+64fa

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

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

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