Answer :

Let's factorise the quadratic expression [tex]\(10x^2 - 9x + 2\)[/tex].

1. Identify the quadratic expression:
[tex]\[ 10x^2 - 9x + 2 \][/tex]

2. Look for two binomials that multiply to give the quadratic expression. These binomials will typically take the form:
[tex]\[ (ax + b)(cx + d) \][/tex]
where [tex]\(a \cdot c = 10\)[/tex] (the coefficient of [tex]\(x^2\)[/tex]), and [tex]\(b \cdot d = 2\)[/tex] (the constant term).

3. We also need [tex]\(a \cdot d + b \cdot c\)[/tex] to equal [tex]\(-9\)[/tex] (the coefficient of [tex]\(x\)[/tex]).

After looking at the coefficients, let’s consider possible pairs of factors:

- For the coefficient of [tex]\(x^2\)[/tex] ([tex]\(10\)[/tex]): possible pairs are [tex]\((10, 1)\)[/tex] and [tex]\((5, 2)\)[/tex].
- For the constant term ([tex]\(2\)[/tex]): possible pairs are [tex]\((2, 1)\)[/tex] and [tex]\((-2, -1)\)[/tex].

We need to find the right combination such that the middle term adds up to [tex]\(-9x\)[/tex].

After trying different combinations, we identify the correct pairings as:
[tex]\[ (2x - 1) \text{ and } (5x - 2) \][/tex]

4. Verify the factorisation:
[tex]\[ (2x - 1)(5x - 2) \][/tex]

Expand it to check:
[tex]\[ (2x - 1)(5x - 2) = 2x \cdot 5x + 2x \cdot (-2) + (-1) \cdot 5x + (-1) \cdot (-2) \][/tex]
[tex]\[ = 10x^2 - 4x - 5x + 2 \][/tex]
[tex]\[ = 10x^2 - 9x + 2 \][/tex]

Thus, the correct factorisation of [tex]\(10x^2 - 9x + 2\)[/tex] is:
[tex]\[ (2x - 1)(5x - 2) \][/tex]