4n + 3 = 15 4n +3 - 3 = 15 - 3 4n = 12 4n/4 = 12/4 n = 3
n = 1 7n + 6n - 5 = 4n + 4 13n - 5 = 4n + 4 13n - 4n - 5 = 4n - 4n + 4 9n - 5 = 4 9n -5 + 5 = 4 + 5 9n = 9 n = 1
4n = 48 4n/4 = 48/4 (Divide by 4 on both sides and then cancel) n = 12
4
4n + 5
4n + 3 = 15 4n +3 - 3 = 15 - 3 4n = 12 4n/4 = 12/4 n = 3
n3 + 3n2 + 4n + 12 = (n3 + 3n2) + (4n + 12) = n2(n + 3) + 4(n + 3) = (n2 + 4)(n + 3).
Yes. Multiplying out the brackets on the second one: 4(n + 3) = 4×n + 4×3 = 4n + 12.
4n+13=1 -13 -134n=-12/4 /4n=-3
Subtracting 3n from each side gives 12 = 4n or 4n = 12. n = 12/4 n = 3
12+4n = 2n12+4n-4n = 2n-4n12 = -2n-1/2(12 = -2n)-6 = n
4n + 9 = -3 Now, we take away 9 from both sides 4n = -12 Now divide by 4 n = -3
n = 1 7n + 6n - 5 = 4n + 4 13n - 5 = 4n + 4 13n - 4n - 5 = 4n - 4n + 4 9n - 5 = 4 9n -5 + 5 = 4 + 5 9n = 9 n = 1
2n+4n-12 = 06n-12+12 = 126n = 121/6(6n = 12)n = 2
4n = 48 4n/4 = 48/4 (Divide by 4 on both sides and then cancel) n = 12
5n - n = 8 + 4 ie 4n = 12 so n = 3
4n + 3 = 19Subtract 3 from each side:4n = 16Divide each side by 4:n = 4