$\text{a)(x+10)²=-16}$ $\text{⇒(x+10)²=-4²}$ $\text{⇒x+10=-4}$ $\text{⇒x=(-4)-10}$ $\text{⇒x=-14}$ $\text{Vậy x=-14}$ b)$5^x$+5^{x+2}=650 $\text{⇒$5^x$+$5^x$+25=650}$ $\text{⇒$5^x$·(1+25)=650}$ $\text{⇒$5^x$+26=650}$ $\text{⇒$5^x$=650:26}$ $\text{⇒$5^x$=25}$ $\text{⇒$5^x$=25}$ $\text{⇒$5^x$=5²}$ $\text{⇒x=2}$ $\text{Vậy x=2}$ Đăng nhập để trả lời
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