QUESTION FOUR a Given that 21nx+1n3=In(5x+2). form px²+x+r=0 stating the values of p. q and r b. Hence, show that 21nx +In3 = ln (5x+2) has only one valid solution. c. Given f(x) = 2x² + 6x +3₂ į Use first principles to find f (x) ii. Hence find f(3) Show that it can be written in the

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