Solve log_2(3x + 7) = 3 + log_2(x – 1), x > 1.

Begin by collecting log_2 terms.log_2(3x + 7) - log_2(x – 1) + = 3 Using the rule of log terms we getlog_2((3x+7)/(x-1)) = 3 (3x+7)/(x-1) = 233x+7 = 8(x-1)3x+7-8x+8 = 0 -5x+15 = 0 x= 3

CF

Related Maths Scottish Highers answers

All answers ▸

The line, L, makes an angle of 30 degrees with the positive direction of the x-axis. Find the equation of the line perpendicular to L, passing through (0,-4).


show y=3x-5 is tangent to x^2 + y^2 +2x -4y - 5 = 0 and the point where they touch


Determine for what values of c, f(x)=4x^2-(2c+8)x+4 has no real roots.


A circle has equation x^2+y^2-8x+10y+41=0. A point on the circle has coordinates (8,-3). Find the equation of the tangent to the circle passing through this point.