Algebraic identities|Brain teasers |Q1B(b) If x^2 + 1/x^2 = 6 , find x^4 + 1/x^4

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Brain teasers Q1 B (b) If x^2 + 1/x^2 = 6 , find x^4 + 1/x^4

Brain Teasers
Q6 Evaluate x
(i)if 36x =78²-42²
(ii)6.2x =8.1x8.1-1.9x1.9

Practice Questions

Show that.
(i) (3x + 7)² – 84x = (3x – 7)²
(ii) (9p – 5q)²+ 180pq = (9p + 5q)²
(iii) (4pq + 3q)²– (4pq – 3q)² = 48pq²
(iv) (a – b) (a + b) + (b – c) (b + c)+ (c – a) (c + a) = 0

Hands on activities