7 ^ 2x - 6 * 7 ^ x + 5 = 0
7 ^ x = a ; a > 0
a^2 - 6a + 5 = 0
D = 36 - 20 = 16 = 4^2
a1 = ( 6 + 4 ) : 2 = 5
a2 = ( 6 - 4 ) : 2 = 1
7 ^ x = 5 ⇒ x = log ₇ 5
7 ^ x = 1 ⇒ x = 0
<span>
a³-3a+2=a(a²-3)+2</span><span>;
</span><span>x³+3x²-4=x²(x+3)-4</span>
1) pc+3c^2-(3c^2-3cp-cp-p^2)=cp+3c^2-3c^2+3cp+cp+p^2=p^2+5cp
<span>y=x²-3.
1) x=5
y = 5</span>²-3
<span>y=22
2) x=-4
y=(-4)</span>²-3
<span>y = 13
3) x=0,1
y = 0,01-3
y=-2,99
4)x=0
y = -3</span>