3(х+5)-х²=(2-х)(2+х)
3х+15-х²=4-х²
3х+15=4
3х=4-15
3х= -11
х= -11/3= -3 2/3
по формуле (а-б)(а+б)=а²-б²
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3(х+5)-х²=(2-х)(2+х)
3х+15-х²=4-х²
3х+15=4
3х=4-15
3х= -11
х= -11/3= -3 2/3
по формуле (а-б)(а+б)=а²-б²