book Maths Puzzle Numerical Ability

x2+2x+3=0 have to solve it by fatrisation or by completing square. from new syllabus d book 3 chapter 1 ex 1c.

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book Other Question

Suppose an orchard is planted with trees in straight rows. If there are 5x - 4 rows with 5x - 4 trees in each row, how many trees are there in the orchard? what is (-5y3)(-4y8)